Jet HVBS-710S, Operating Instructions And Parts Manual

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2. Raise bow to vertical position, and secure in
place by turning off hydraulic cylinder.
3. Remove red blade guard (A, Figure 19) by
removing two screws.
Red blade guard must be
reinstalled after new blade is fitted.
Figure 19
4. Remove brush assembly (B, Figure 19) by
removing two screws.
5. Loosen blade tension by turning handle (C,
Figure 20) counterclockwise.
Figure 20
6. Open back cover by loosening two lock knobs
(D, Figure 20).
7. Carefully remove old blade. NOTE: Leather
gloves are recommended when handling saw
blades.
8. Install new blade first between bearing guides.
Make sure blade teeth face same direction as
shown on the blade direction label on saw. (If
teeth still point in wrong direction despite
mounting blade properly, the blade has been
turned inside-out. Twist blade right side-out
and reinstall.)
9. Position blade around wheels, making sure it
rests near the flange on both wheels.
10. Tension blade using handle. Do not over-
tension. See section 9.8, Blade tension .
11. Close back cover and secure with knobs.
12. Install red blade guard, and brush assembly.
13. Connect machine to power source.
14. Run machine to verify that blade is tracking
properly. See section 9.9, Blade tracking .
9.8 Blade tension
Disconnect machine from
power source, and use caution when working
with sharp blade.
Blade tension is vital to achieving proper results
from the band saw. For shipping purposes, the
blade may not be at full tension – verify tension
before operating.
Proper blade tension is 1550 to 1760 kg/cm
2
(22000-25000 lb/in
2
) as measured on a blade
tension gauge (not provided).
To set tension without the use of a tension gauge:
1. Disconnect machine from power source.
2. Install blade between wheels and between
bearings on blade guides.
3. Lightly tension blade to remove any sag by
turning handle (C, Figure 20) slightly
clockwise.
4. Turn tension handle (C, Figure 20) 1-3/4 to two
revolutions clockwise.
5. Close covers, connect to power source, and
run saw for 2 to 3 minutes to allow blade to
seat properly.
6. Disconnect machine from power source. Open
cover and loosen blade until it just begins to
sag.
7. Tighten blade until it straightens between
blade wheels and all sag is eliminated.
8. Tighten blade by turning handle (C, Figure 20)
two full revolutions.
Do not overtighten blade; this
may cause it to stretch or warp.
TIP: Slacken blade tension when finished with
operations, to prolong blade life. Make note of
indicator position on tension label (E, Figure 20) for
quickly returning tension to its previous setting.
9.9 Blade tracking
Tracking the blade requires
that the band saw be operating while the back
cover is removed. This adjustment should be
performed by qualified persons only.